package day21;

import java.util.Collection;
import java.util.HashSet;

public abstract class Rectangle {
    private  int width;
    private int length;

  void getHaha(){
      System.out.println("1");
  }

    public Rectangle(int width, int length) {
        this.width = width;
        this.length = length;
        getHaha();
    }

    public static void main(String[] args) {
        Collection<String> collection=new HashSet<>();
    }
}
